Note1104_Flip Flop
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Tuesday
Today, I am going to prepare the new tutorial notes. It is about the sequential logic. Just as we all know the sequential logic is based on the combinational logic. Before the sequential logic, we need memory elements as followings.
The above is the architecutre for different kind of flip-flops.
The characteristic table defines the logical properties of a flip-flop by describing its operation in the tabular form. Of course, compared with the reset and set function, for the flip-flops, we could also introduce one special input called preset or direct set.
Analysis describes what a given circuit will do under certain operating conditions. The behavior of a clocked sequential circuit is detded hm the inputs, the outputs, rmd the state of its flip-flops. The analysis of a sequential circuit consists of obtaining a table or a diagram for the time sequence of inputs, outputs and internal states. It is also possible to write Boolean expressions that describe the behavior of the sequential circuit. Those expressions must include the necessary time sequence, either directly or indirectly.
A state equation, a transition equation specifies the next state as function of the present state and inputs.
The time sequence of inputs, outputs, and flip-flop states can be enumerated in a state table. (sometimes called a transition table.)
The information available in state table can be represented graphically in the form of a state diagram. In this type of diagram, a state is represented by a circle, and the transitions between states are indicated by directed lines connecting the circles. There is no difference between a state table and a state diagram, except in the manner of representation.
The most general model of a sequential circuit has inputs, outputs, and internal states. It is customary to distinguish between two models of sequential circuits: Mealy model and the Moore model.
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